Terry weaving method for creating variable loop heights and a terry loom for carrying out said method

Abstract

A terry weaving method and a terry loom for carrying out the method. Subject matter of the terry weaving method is that a slay travel shortening does not result during the carrying out of partial beat-ups for the formation of a weft thread group, and thus the original weft thread insertion window remains maintained. The terry loom has a servo drive ( 7 ) that displaces the reed support shaft ( 4 ) in the direction of the shed forming means by at least the pre-beat-up distance (VD) while maintaining the basic stroke H of the reed ( 11 ) before the forming of the weft thread group, and that reverses or undoes the displacement by at least the pre-beat-up distance (VD) after the forming of the weft thread group.

1. Terry weaving method for producing a terry fabric with variable loop height ( 12   a ) in the terry fabric ( 12 ), wherein a loom shed ( 15 ) consisting of ground warp threads ( 13 ) and pile warp threads ( 14 ) is formed in a first work step, wherein weft threads ( 16 ) are inserted into the loom shed ( 15 ) in a second work step, wherein each inserted weft thread ( 16 ) is partially beat-up and the weft threads ( 16 ) thereby form a weft thread group ( 16   a ) in a third work step, which weft thread group takes up a pre-beat-up distance (VD) relative to the beat-up edge ( 12   b ) of the terry fabric ( 12 ), and wherein the reed ( 11 ), while carrying out a basic stroke (H), beats up the weft thread group ( 16   a ) against the beat-up edge ( 12   b ) of the terry fabric ( 12 ) while forming pile loops ( 12   a ) with the pile warp threads ( 14 ) in a fourth work step, characterized in that, before the forming of the weft thread group ( 16   a ) the reed support shaft ( 4 ) is displaced by at least a rotational angle amount in the direction of the loom shed ( 15 ) forming means ( 17 ) in such a manner so that the basic stroke (H) of the reed ( 11 ) remains maintained in the forming of the weft thread group ( 16   a ), and in that, after the forming of the weft thread group ( 16   a ), the displacement of the reed support shaft ( 4 ) is reversed or undone by this rotational angle amount. 
   
   
     2. Terry weaving method according to  claim 1 , characterized in that the rotational angle displacement amount corresponds to at least the amount of the pre-beat-up distance (VD) of the weft thread group ( 16   a ). 
   
   
     3. Terry weaving method according to  claim 1 , characterized in that the rotational angle displacement for the formation of the weft thread group ( 16   a ) is carried out controlled in a single-weft-wise manner. 
   
   
     4. Terry weaving method according to  claim 1 , characterized in that the rotational angle displacement for the formation of the weft thread group ( 16   a ) is carried out controlled in a weft-group-wise manner. 
   
   
     5. Terry weaving method according to  claim 1 , characterized in that the reversing or undoing of the rotation angle displacement is carried out controlled in a weft-group-wise manner. 
   
   
     6. Terry weaving method according to  claim 1 , characterized in that the at least one rotational angle displacement amount and the reversing or undoing thereof is carried out by a servo drive. 
   
   
     7. Terry loom for carrying out the terry weaving method according to patent  claim 1 , comprising
 at least one support ( 10 ) for a reed ( 11 ) connected with a reed support shaft ( 4 ) as pile forming means, 
 at least one electric motor drive ( 2 ), of which the rotation is converted into a forward and backward rotation having a limited rotational angle and is transmitted to an output shaft ( 1   a ) of at least one transmission ( 1 ) that comprises a complementary cam set, 
 means ( 5 ) for the transmitting of the rotational-angle-limited forward and backward rotation to the reed support shaft ( 4 ), whereby one of the means is at least one controllable servo drive ( 7 ), and 
 an electronic control via which the servo drive ( 7 ) is freely controllably activatable, 
 characterized thereby 
 that the reed support shaft ( 4 ) is a shaft separated from the output shaft ( 1   a ) of the transmission ( 1 ), 
 that a first suitable transmission means ( 5 ) is drive-connected directly with the output shaft ( 1   a ), and 
 that the transmission means ( 5 ) is operatively connected with the reed support shaft ( 4 ) via further means ( 7 ,  7   a ;  8 ;  9 ), whereby the means ( 7 ) is the controllable servo drive. 
 
   
   
     8. Terry loom according to  claim 7 , characterized in that the transmission means ( 5 ) with the servo drive ( 7 ) forms a structural unit. 
   
   
     9. Terry loom according to  claim 7 , characterized in that the servo drive ( 7 ) is operatively connected with the reed support shaft ( 4 ) via a reduction gearing. 
   
   
     10. Terry loom according to  claim 9 , characterized in that the reduction gearing is formed of the pinion gear ( 8 ) and the toothed gear wheel ( 9 ). 
   
   
     11. Terry loom according to  claim 1 , characterized in that the servo drive ( 7 ) is an electric motor drive. 
   
   
     12. Terry loom according to  claim 1 , characterized in that the servo drive ( 7 ) is a hydraulic drive. 
   
   
     13. Terry loom according to  claim 1 , characterized in that the servo drive ( 7 ) is a pneumatic drive. 
   
   
     14. Terry loom according to  claim 8 , characterized in that the structural unit ( 5 ,  7 ) is effective as mass compensation of reed ( 11 ) and reed support ( 10 ) during the woven fabric formation.